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Functionalization of polyphenylene ether
by：CSSSLD
2021-02-03
Sulfonated PPO and amination PPO compared with injection molding feedstock PPO, its heat resistance variation is not large, and its solubility increased significantly, so that the PPO as membrane materials can provide choice when using solvent type expanded.
Sulfide and PPO amination PPO can be used in the production of gas separation membrane, filter membrane, such as sulfonated PPO and amination PPO in water treatment, air purification and so on will have inestimable prospect.
the chemical modification method, the bromine with flame retardant properties or phosphorus element is introduced into the main chain or side chain of PPO, small molecule flame retardant easy migration can overcome the shortcomings. PPO of bromide and phosphate esterification reaction in the solvent. PPO bromination reaction depending on the reaction conditions can generate bromination of benzene ring and methyl bromide two kinds of products. In general, the lower the concentration of bromine, the higher the reaction temperature, the more prone to radical substitution reaction, generation of methyl bromide.
PPO amination completed by two steps, first will be the nitro benzene substitution reaction, then amination PPO is obtained by reduction reaction. PPO sulfonated chloroform as solvent, using chlorosulfonic acid as sulfonating agent, with functions of ion exchange of sulfonated PPO. The sulfonated rate of PPO and the concentration of the repeat unit of benzene ring and chlorosulfonic acid concentration is proportional to the. PPO also can be in homogeneous system using sulfonated reaction of sulfuric acid, sulfonated rates low.
the glass transition temperature of different bromide products are different from each other. Because bromine atom is hardened, so after the introduction of bromine atoms on PPO benzene ring, PPO more illiquid, at the same time because of bromine atoms and electrons on the benzene ring, and van der Waals force between space steric hindrance between the molecules increase, PPO skeleton dislocation is difficult, and glass transition temperature of PPO increased, while the bromine atom, introduced on the side of the methyl, will be like a plasticizer conveyor chain accumulation, abate molecules, the forces between the lowering the glass transition temperature of the PPO.
from the PPO processing performance considerations, side than benzene methyl bromide bromide more advantageous to improve the processing properties of PPO. Phosphating reaction mechanism of PPO is electrophilic substitution reaction, phosphate esterification PPO can by reactions of methyl bromide. PPO will be generated in the process of esterification reaction of phosphate gel insolubles, therefore in the preparation of phosphate esterification PPO, reaction conditions must be strictly controlled. Gel reaction and reaction process of alkanes heartland of phosphate concentration, caused by heat rate, stirring rate and so on, by adding excessive amounts of alkanes heartland of phosphate ester, try to reduce the heat rate, and strong stirring can avoid the generation of gel.
functional PPO injection molding processing materials is mainly based on the structure of PPO was modified and implemented, such as the use of bromide, phosphate esterification, sulphur, etc to increase the solubility of PPO and permeability, or give PPO flame retardant used in the preparation of thin film materials and used for flame retardant material. The purpose of the PPO bromide and phosphate esterification is mainly in order to improve the flame retardancy of PPO. Flame retardant modification of PPO can use small molecules to join in the matrix of flame retardants, such as halide or phosphate to achieve, but in the use process, this kind of small molecules will migrate to the surface from a polymer matrix, cause environmental pollution.
on the fat side chain of PPO phosphate are introduced, and the introduction of bromine atoms are the same, the same due to loose the chains and weakened the intermolecular action, which reduces the glass transition temperature of PPO. Unlike brominated PPO, phosphoric acid, phosphate esterification of PPO base volume is greater than the volume of bromine atoms, its plasticizing effect than bromine atoms, thus the characteristics of the phosphate esterification PPO than brominated PPO viscosity properties of high viscosity.
more excellent articles: the application of modified polycarbonate, click directly.
http://www。 csssld。 cn//html/2016/Info_1125/413。 HTML
nantong on suye's official website: http://www. csssld。 cn//
the chemical modification method, the bromine with flame retardant properties or phosphorus element is introduced into the main chain or side chain of PPO, small molecule flame retardant easy migration can overcome the shortcomings. PPO of bromide and phosphate esterification reaction in the solvent. PPO bromination reaction depending on the reaction conditions can generate bromination of benzene ring and methyl bromide two kinds of products. In general, the lower the concentration of bromine, the higher the reaction temperature, the more prone to radical substitution reaction, generation of methyl bromide.
PPO amination completed by two steps, first will be the nitro benzene substitution reaction, then amination PPO is obtained by reduction reaction. PPO sulfonated chloroform as solvent, using chlorosulfonic acid as sulfonating agent, with functions of ion exchange of sulfonated PPO. The sulfonated rate of PPO and the concentration of the repeat unit of benzene ring and chlorosulfonic acid concentration is proportional to the. PPO also can be in homogeneous system using sulfonated reaction of sulfuric acid, sulfonated rates low.
the glass transition temperature of different bromide products are different from each other. Because bromine atom is hardened, so after the introduction of bromine atoms on PPO benzene ring, PPO more illiquid, at the same time because of bromine atoms and electrons on the benzene ring, and van der Waals force between space steric hindrance between the molecules increase, PPO skeleton dislocation is difficult, and glass transition temperature of PPO increased, while the bromine atom, introduced on the side of the methyl, will be like a plasticizer conveyor chain accumulation, abate molecules, the forces between the lowering the glass transition temperature of the PPO.
from the PPO processing performance considerations, side than benzene methyl bromide bromide more advantageous to improve the processing properties of PPO. Phosphating reaction mechanism of PPO is electrophilic substitution reaction, phosphate esterification PPO can by reactions of methyl bromide. PPO will be generated in the process of esterification reaction of phosphate gel insolubles, therefore in the preparation of phosphate esterification PPO, reaction conditions must be strictly controlled. Gel reaction and reaction process of alkanes heartland of phosphate concentration, caused by heat rate, stirring rate and so on, by adding excessive amounts of alkanes heartland of phosphate ester, try to reduce the heat rate, and strong stirring can avoid the generation of gel.
functional PPO injection molding processing materials is mainly based on the structure of PPO was modified and implemented, such as the use of bromide, phosphate esterification, sulphur, etc to increase the solubility of PPO and permeability, or give PPO flame retardant used in the preparation of thin film materials and used for flame retardant material. The purpose of the PPO bromide and phosphate esterification is mainly in order to improve the flame retardancy of PPO. Flame retardant modification of PPO can use small molecules to join in the matrix of flame retardants, such as halide or phosphate to achieve, but in the use process, this kind of small molecules will migrate to the surface from a polymer matrix, cause environmental pollution.
on the fat side chain of PPO phosphate are introduced, and the introduction of bromine atoms are the same, the same due to loose the chains and weakened the intermolecular action, which reduces the glass transition temperature of PPO. Unlike brominated PPO, phosphoric acid, phosphate esterification of PPO base volume is greater than the volume of bromine atoms, its plasticizing effect than bromine atoms, thus the characteristics of the phosphate esterification PPO than brominated PPO viscosity properties of high viscosity.
more excellent articles: the application of modified polycarbonate, click directly.
http://www。 csssld。 cn//html/2016/Info_1125/413。 HTML
nantong on suye's official website: http://www. csssld。 cn//
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